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Joined: May 2002
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isaac
ECelica Admin
isaac Jul 16, 8:07am - #224193 
2001 Absolutely Red Toyota Celica GT
ECelica Admin
2001 Toyota Celica GT

Joined: May 2002
Posts: 6,007
Los Angeles, CA
CEL... mine likes to go OFF and ON... and then back OFF again

I have a CEL PO420 that keeps coming up for the past 5 months... it would bother me for the first two months, then i found out what it was - it had something to do with my car's CAT system ( rolleyes )

well, the light usta come on just about every time i hit half tank of gas - then I'd reset it again ands the light wouldn't come back on again until i hit half tank again.

for the last two months, i just ignored the light and it stayed on for those several weeks. I've grown to just pretend that it wasn't there.

now for the past 2 weeks, i keep forgetting about it being on. but during my drive, it seems to magically attract my attention... hmmmmmmmm wtf

I decided to reset it again for the first time in 2 months. This time i reset it right before making the 300 mile trek out to Las Vegas last weekend - and sure enough, the light came on again within the first 150 miles (about 1/2 tank)

i ignored it... but when coming back from Vegas, i noticed that the light was not ON all the time... it only turned on at half tank, but was off all before that point (i wasn't really paying attention to it, up until the point when it turned ON again)

Now tonight, I actually witnessed the light turn ON again... then drove 10 miles to my parents with the light ON and during that time, i watched the light turn OFF... its been OFF ever since - but i assume it will be back again.

how weird is it that a CEL will just "fix it-self"?
...is this totally unheard-of confused

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BReakinDrifTs
Senior Member
BReakinDrifTs Jul 16, 8:09am - #224194 
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Valencia, CA
wtf That's straange, don't know what to tell you but good luck figuring it out. thumbsup
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morris
BerraquĆ­sima!
morris Jul 16, 8:53am - #224195 
2000 White Toyota Celica GT
BerraquĆ­sima!
2000 Toyota Celica GT

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Orange County, CA
confused spineyes eek wtf
You are the MASTER baby!!!! laughsilly
j/k
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Virgilson
TheFilipinoCrew
Virgilson Jul 16, 9:19am - #224196 

TheFilipinoCrew
2000 Toyota Celica GT

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Pomona, CA
haha same here isaac, sometimes my CEL pops up and then after a day or so it just turns off. confused
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stefanoc
Specialist
stefanoc Jul 16, 9:47am - #224197 

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2002 Toyota Celica

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CA
must be something wrong or else the light wouldnt turn on and off for no reason. inspect the part that the code says. take it to dealer or something. all these 2 years im working by a shop, there NEVER a time where a problem is unsolved. i know im not helping you guys in any way, but i would definetely check it and fix it, cz when the CEL really needs to come on for something major, you wouldnt care or you wouldnt know that something else is wrong cz the light is already on
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vebe1
Member
vebe1 Jul 16, 3:32pm - #224198 
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The only time I have had that problem is when I have a had a CEL for evaporative emissions (cant remember the number of the code). Well basically it was because the gas cap wasnt making a good seal and the light would come on with about half a tank and then sometimes go off on its own while driving and then it would also go off sometimes when I re-filled the tank.
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xXMaGNuSXx
hookah-meister
xXMaGNuSXx Jul 16, 5:33pm - #224199 
2000 Liquid Silver Toyota Celica GT
hookah-meister
2000 Toyota Celica GT

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Smog City LA
i've noticed mine goes on when it's just about time for an oil change...and i get the same code. Something with the emissions system. i don't have the on-off problem tho.

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Anonymous Jul 16, 5:48pm - #224200 
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My CEL has been coming off and on lately. I dont know what to do cause some days it will be on then somedays it will be off. Im sure if its something major the CEL will just start blinking out of control then i will take it in lol grin
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isaac
ECelica Admin
isaac Jul 16, 5:52pm - #224201 
2001 Absolutely Red Toyota Celica GT
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2001 Toyota Celica GT

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spaztikid
dikitzaps
spaztikid Jul 16, 5:56pm - #224202 
dikitzaps
1974 Toyota Celica

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LA
if your cat is fucked up, it might give different readings...


what i'd do:

1: replace the cat with a "performance" cat, ytou might make 1 hp in the process...

2: remove the cat, and get one of those switches that fool the sensors into thinking everything is good...

... thats if the cat is the problem...

the fact the the gas level has something to do with it is weird...
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DiabloGTS
Wheezy Joe
DiabloGTS Jul 16, 6:28pm - #224203 

Wheezy Joe
2002 Kawasaki Ninja 250

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Lafayette, LA
Isaac, evap. control codes do not reset themselves.

Chances are, if it's coming on/off by itself, you have a more serious electrical/ECU related problem.

EVAP/Emissions codes are programmed to remain in the "On" position until removed, and they are even stuck in memory after you flash the ECU for up to FOURTY times. (I.E. you leave the gas cap off, you will get a CEL from that until you reset/start/run the car for 40 cycles)

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Virtuous_One
Senior Member
Virtuous_One Jul 17, 9:51pm - #224204 

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SAN DIEGO
Have them do an electronic's dianostic check on your cars system... thumbsup
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isaac
ECelica Admin
isaac Jul 17, 10:17pm - #224205 
2001 Absolutely Red Toyota Celica GT
ECelica Admin
2001 Toyota Celica GT

Joined: May 2002
Posts: 6,007
Los Angeles, CA
Originally Posted by Virtuous_One

Have them do an electronic's dianostic check on your cars system... thumbsup


i have done that already - thats how i knew it was PO420, CAT SYSTEM grin
https://www.celicahobby.com/ubbthreads/thread.f_1870112628_0_collapsed_2__1.html

unless you were taling about something else?
thanks, it is good advice though rice

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slidr
Specialist
slidr Jul 17, 11:42pm - #224206 

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2000 Toyota Celica

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Saint Louis, MO
Might wanna check/replace your heated O2 sensor.

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Larry_GTS
Specialist
Larry_GTS Jul 18, 12:03am - #224207 
2003 Yellow/Red Toyota Celica
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2003 Toyota Celica

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Texas
i'm kindda at a loss here , I don't think I can help any. frown
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grcelica
Specialist
grcelica Jul 18, 12:05am - #224208 

Specialist
2001 Toyota Celica GT

Joined: Nov 2002
Posts: 1,073
NW, PA
Originally Posted by slidr
Might wanna check/replace your heated O2 sensor.


Thats what I was gonna say. I had an O2 go bad, and got similar CEL activity. It also ran poorly tho..like bad gas!!
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QTRMLR_1
Specialist
QTRMLR_1 Jul 18, 3:38am - #224209 

Specialist
2002 Toyota Celica

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Posts: 1,376
Los Angeles, CA
try running some good fuel system cleaner through the fuel system as that can clean dirty 02 sensors and may save you the trouble of getting new one(s) especially if your warranty is up. Redline is SI-1 is strong stuff.

I get my kicks on EC.
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grcelica
Specialist
grcelica Jul 18, 7:09pm - #224210 

Specialist
2001 Toyota Celica GT

Joined: Nov 2002
Posts: 1,073
NW, PA
O2 sensors are in the exhaust. Fuel cleaner won't help them
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